Clock



FIG. 1 is a perspective view taken from above and one side of a clockshowing my new design;

FIG. 2 is a front elevation thereof;

FIG. 3 is a rear elevation thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof; and

FIG. 6 is a side elevation thereof.

The ornamental design for a clock, as shown and described.